THE CHROMOSOMES 181 



pollen mother cells 72 chromosomes (Fig. 478, c). | 



Both of these giant plants were larger than the | 



normal plant; they grew more \'igorously and all ^ 



of the cells were larger. The difference in size j 



extends to the flowers, to the pollen, stomata, ' 



trichomes, etc., and even the starch plastids are , 

 larger. This latter condition seems anomalous, but 



Winkler states that even in normal plants the size | 



of these plastids varies with the size of the cells ' 



containing them. I 



